如何通过订阅 Observable 来过滤 ID

Question

Below I am subscribing to an observable but just updating values for the first object. I am passing through ID = 413 I would like to filter the ID so I can only get that object, can anyone help me please?

Thanks

this.Ordersummary.subscribe(
        r => {
            if (r.length != 0) {
                this.thepackage = r[0];
                this.emptySummary = true;
            } else {
                this.router.navigate(['packages/gbr/public']);
            }
        });

Answer 1

You can always use map and filter. Or if you want the subscribe to only trigger for a specific value, then you have to filter first.

Something like this:

pipe(
  filter(item => item.ID === 413)
).subscribe(val => console.log(val));

Answer 2

If you want to filter only the necassary id then you may create a simple method like this,

filterById(yourId: number) {
    this.filteredPackage = this.thepackage.filter(package => package.id === yourId);
}

Explanation:

After assigning your response to the this.thepackage object inside subscribe(), your response is globally accessible via this.thepackage object. In order to get the single record who's ID is 413, just pass the ID into the method filterById() . Since it's bad to modify the original object, we assign the newly filtered item to a new variable this.filteredPackage .

this.filterById(yourId);    // yourId is 413 here

Answer 3

this.Ordersummary.pipe(
        filter((item: any) => item.id === this.packageid)
    ).subscribe(val => console.log('VAL: ', val));

I am not getting anything in console when I click on item 413